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12th Standard English Medium Chemistry Subject Organic Nitrogen Compounds Creative 2 Mark Questions with Solution Part - I

Published on: 21/06/2021

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Std: 12th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

Explain why amines are more basic than amides.

Explain why aniline is less basic than methylamine?

What happens when aniline is treated with bromine?

How will you distinguish between ethylamine and diethylamine?

What happens when acetonitrile is hydrolysed?

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Answers Key:

Generic 2

5 x 2 = 10

In simple amines the lone pair of electrons is on nitrogen and hence available for protonation. In amides, on the other hand, the electron pair on nitrogen is delocalized to the carbonyl oxygen through resonance.

(i) The lone pair of electrons on the nitrogen atom of aniline is involved in resonance and not available for donation to protons.
(ii) Protonation becomes difficult.
(iii) So aniline is a weaker base than methylamine.

Aniline decolourises bromine water with the formation of white precipitate which is 2,4,6-tribromo aniline

S. NO.	Ethylamine	Diethylamine
i.	It reacts with CHCl₃ and KOH forms carbylamine.	It does not react with CHCl₃ and KOH.
ii.	It reacts with HNO₂ and forms ethyl alcohol.	It reacts with HNO₂ and form N-nitroso amine (Yellowish oil).